Two seventh-graders went to the TeWinkle front office at 12:40 p.m., complaining of stomach issues, Newport-Mesa Unified School District spokeswoman Laura Boss said.

After school administrators believed they had handled the issue, a third seventh-grader came to the office complaining of similar symptoms, she said.

Two other students are being investigated in connection to the incident, and the student suspected of bringing the brownie to school was not transported to the hospital, Boss said.

"Honestly, this has become a police investigation because of the nature of it," Boss said.

Expulsion and suspension are possibilities for the students who brought and ate the baked good depending on whether they knew it contained marijuana, Boss said, but it's unclear whether the students were aware.